What could be the reason for plowing so deep, preparing virgin lands, or planting certain varieties that require better growth in addition to deep turning for easy penetration into the soil and therefore better holding power to protect from wind.
Contractor Bijker Bulldozerverhuur of Rouveen, Netherlands appears to be engaged in deep farming using a Caterpillar D8H. D8E and D6R with 650HP combined horsepower! The plow is self-made and goes down to two meters deep. Topsoil is plowed under and lighter sand and peat soil is brought to the surface, making the land more suitable for other crops and easier to work with.